diff --git a/libstdc++-v3/testsuite/25_algorithms/copy/constrained.cc b/libstdc++-v3/testsuite/25_algorithms/copy/constrained.cc
index 85f7d649608..aafe845db3a 100644
--- a/libstdc++-v3/testsuite/25_algorithms/copy/constrained.cc
+++ b/libstdc++-v3/testsuite/25_algorithms/copy/constrained.cc
@@ -70,8 +70,8 @@ test01()
       std::vector<int> y(3);
       const int z[3] = { 1, 2, 3 };
       auto [in, out] = ranges::copy(x, ranges::begin(y));
-      VERIFY( in.base() == x.data()+3 );
-      VERIFY( out.base() == y.data()+3 );
+      VERIFY( in == x.begin()+3 );
+      VERIFY( out == y.begin()+3 );
       VERIFY( ranges::equal(y, z) && ranges::equal(x, z) );
     }
 
@@ -81,8 +81,8 @@ test01()
       std::vector<int> y(3);
       const int z[3] = { 1, 2, 3 };
       auto [in, out] = ranges::copy(x, ranges::begin(y));
-      VERIFY( in.base() == x.data()+3 );
-      VERIFY( out.base() == y.data()+3 );
+      VERIFY( in == x.begin()+3 );
+      VERIFY( out == y.begin()+3 );
       VERIFY( ranges::equal(y, z) && ranges::equal(x, z) );
     }
 
@@ -93,8 +93,8 @@ test01()
       auto [in,out] = ranges::copy(make_reverse_iterator(x.end()),
 				   make_reverse_iterator(x.begin()),
 				   make_reverse_iterator(y.end()));
-      VERIFY( in.base().base() == x.data()+3 );
-      VERIFY( out.base().base() == y.data() );
+      VERIFY( in.base() == x.begin()+3 );
+      VERIFY( out.base() == y.begin() );
       VERIFY( ranges::equal(y, z) && ranges::equal(x, z) );
     }
 
@@ -105,8 +105,8 @@ test01()
       auto [in,out] = ranges::copy(make_reverse_iterator(x.end()),
 				   make_reverse_iterator(x.begin()),
 				   make_reverse_iterator(y.end()));
-      VERIFY( in.base().base() == x.data()+3 );
-      VERIFY( out.base().base() == y.data() );
+      VERIFY( in.base() == x.begin()+3 );
+      VERIFY( out.base() == y.begin() );
       VERIFY( ranges::equal(y, z) && ranges::equal(x, z) );
     }
 }
diff --git a/libstdc++-v3/testsuite/25_algorithms/copy_backward/constrained.cc b/libstdc++-v3/testsuite/25_algorithms/copy_backward/constrained.cc
index 900f78aaa73..9df2a2ff593 100644
--- a/libstdc++-v3/testsuite/25_algorithms/copy_backward/constrained.cc
+++ b/libstdc++-v3/testsuite/25_algorithms/copy_backward/constrained.cc
@@ -57,8 +57,8 @@ test01()
       std::vector<int> y(3);
       const int z[3] = { 1, 2, 3 };
       auto [in, out] = ranges::copy_backward(x, ranges::end(y));
-      VERIFY( in.base() == x.data()+3 );
-      VERIFY( out.base() == y.data() );
+      VERIFY( in == x.begin()+3 );
+      VERIFY( out == y.begin() );
       VERIFY( ranges::equal(y, z) && ranges::equal(x, z) );
     }
 
@@ -68,8 +68,8 @@ test01()
       std::vector<int> y(3);
       const int z[3] = { 1, 2, 3 };
       auto [in, out] = ranges::copy_backward(x, ranges::end(y));
-      VERIFY( in.base() == x.data()+3 );
-      VERIFY( out.base() == y.data() );
+      VERIFY( in == x.begin()+3 );
+      VERIFY( out == y.begin() );
       VERIFY( ranges::equal(y, z) && ranges::equal(x, z) );
     }
 
@@ -80,8 +80,8 @@ test01()
       auto [in,out] = ranges::copy_backward(make_reverse_iterator(x.end()),
 					    make_reverse_iterator(x.begin()),
 					    make_reverse_iterator(y.begin()));
-      VERIFY( in.base().base() == x.data()+3 );
-      VERIFY( out.base().base() == y.data()+3 );
+      VERIFY( in.base() == x.begin()+3 );
+      VERIFY( out.base() == y.begin()+3 );
       VERIFY( ranges::equal(y, z) && ranges::equal(x, z) );
     }
 
@@ -92,8 +92,8 @@ test01()
       auto [in,out] = ranges::copy_backward(make_reverse_iterator(x.end()),
 					    make_reverse_iterator(x.begin()),
 					    make_reverse_iterator(y.begin()));
-      VERIFY( in.base().base() == x.data()+3 );
-      VERIFY( out.base().base() == y.data()+3 );
+      VERIFY( in.base() == x.begin()+3 );
+      VERIFY( out.base() == y.begin()+3 );
       VERIFY( ranges::equal(y, z) && ranges::equal(x, z) );
     }
 }
diff --git a/libstdc++-v3/testsuite/25_algorithms/inplace_merge/constrained.cc b/libstdc++-v3/testsuite/25_algorithms/inplace_merge/constrained.cc
index 856056865d9..e6e16c85382 100644
--- a/libstdc++-v3/testsuite/25_algorithms/inplace_merge/constrained.cc
+++ b/libstdc++-v3/testsuite/25_algorithms/inplace_merge/constrained.cc
@@ -40,7 +40,7 @@ test01()
 	v.insert(v.end(), x, x+j);
 	ranges::sort(v);
 
-	test_range<int, bidirectional_iterator_wrapper> rz(&v[0], &v[0]+i+j);
+	test_range<int, bidirectional_iterator_wrapper> rz(v.data(), v.data()+i+j);
 	auto result = ranges::inplace_merge(rz, next(ranges::begin(rz), i));
 	VERIFY( result == rz.end() );
 
diff --git a/libstdc++-v3/testsuite/25_algorithms/move/constrained.cc b/libstdc++-v3/testsuite/25_algorithms/move/constrained.cc
index d205b3572a1..f15de548709 100644
--- a/libstdc++-v3/testsuite/25_algorithms/move/constrained.cc
+++ b/libstdc++-v3/testsuite/25_algorithms/move/constrained.cc
@@ -99,8 +99,8 @@ test01()
       std::vector<int> y(3);
       const int z[3] = { 1, 2, 3 };
       auto [in, out] = ranges::move(x, ranges::begin(y));
-      VERIFY( in.base() == x.data()+3 );
-      VERIFY( out.base() == y.data()+3 );
+      VERIFY( in == x.begin()+3 );
+      VERIFY( out == y.begin()+3 );
       VERIFY( ranges::equal(y, z) && ranges::equal(x, z) );
     }
 
@@ -110,8 +110,8 @@ test01()
       std::vector<int> y(3);
       const int z[3] = { 1, 2, 3 };
       auto [in, out] = ranges::move(x, ranges::begin(y));
-      VERIFY( in.base() == x.data()+3 );
-      VERIFY( out.base() == y.data()+3 );
+      VERIFY( in == x.begin()+3 );
+      VERIFY( out == y.begin()+3 );
       VERIFY( ranges::equal(y, z) && ranges::equal(x, z) );
     }
 
@@ -122,8 +122,8 @@ test01()
       auto [in,out] = ranges::move(make_reverse_iterator(x.end()),
 				   make_reverse_iterator(x.begin()),
 				   make_reverse_iterator(y.end()));
-      VERIFY( in.base().base() == x.data()+3 );
-      VERIFY( out.base().base() == y.data() );
+      VERIFY( in.base() == x.begin()+3 );
+      VERIFY( out.base() == y.begin() );
       VERIFY( ranges::equal(y, z) && ranges::equal(x, z) );
     }
 
@@ -134,8 +134,8 @@ test01()
       auto [in,out] = ranges::move(make_reverse_iterator(x.end()),
 				   make_reverse_iterator(x.begin()),
 				   make_reverse_iterator(y.end()));
-      VERIFY( in.base().base() == x.data()+3 );
-      VERIFY( out.base().base() == y.data() );
+      VERIFY( in.base() == x.begin()+3 );
+      VERIFY( out.base() == y.begin() );
       VERIFY( ranges::equal(y, z) && ranges::equal(x, z) );
     }
 }
diff --git a/libstdc++-v3/testsuite/25_algorithms/move_backward/constrained.cc b/libstdc++-v3/testsuite/25_algorithms/move_backward/constrained.cc
index 3c4aa5dc70d..14f215578c7 100644
--- a/libstdc++-v3/testsuite/25_algorithms/move_backward/constrained.cc
+++ b/libstdc++-v3/testsuite/25_algorithms/move_backward/constrained.cc
@@ -86,8 +86,8 @@ test01()
       std::vector<int> y(3);
       const int z[3] = { 1, 2, 3 };
       auto [in, out] = ranges::move_backward(x, ranges::end(y));
-      VERIFY( in.base() == x.data()+3 );
-      VERIFY( out.base() == y.data() );
+      VERIFY( in == x.begin()+3 );
+      VERIFY( out == y.begin() );
       VERIFY( ranges::equal(y, z) && ranges::equal(x, z) );
     }
 
@@ -97,8 +97,8 @@ test01()
       std::vector<int> y(3);
       const int z[3] = { 1, 2, 3 };
       auto [in, out] = ranges::move_backward(x, ranges::end(y));
-      VERIFY( in.base() == x.data()+3 );
-      VERIFY( out.base() == y.data() );
+      VERIFY( in == x.begin()+3 );
+      VERIFY( out == y.begin() );
       VERIFY( ranges::equal(y, z) && ranges::equal(x, z) );
     }
 
@@ -109,8 +109,8 @@ test01()
       auto [in,out] = ranges::move_backward(make_reverse_iterator(x.end()),
 					    make_reverse_iterator(x.begin()),
 					    make_reverse_iterator(y.begin()));
-      VERIFY( in.base().base() == x.data()+3 );
-      VERIFY( out.base().base() == y.data()+3 );
+      VERIFY( in.base() == x.begin()+3 );
+      VERIFY( out.base() == y.begin()+3 );
       VERIFY( ranges::equal(y, z) && ranges::equal(x, z) );
     }
 
@@ -121,8 +121,8 @@ test01()
       auto [in,out] = ranges::move_backward(make_reverse_iterator(x.end()),
 					    make_reverse_iterator(x.begin()),
 					    make_reverse_iterator(y.begin()));
-      VERIFY( in.base().base() == x.data()+3 );
-      VERIFY( out.base().base() == y.data()+3 );
+      VERIFY( in.base() == x.begin()+3 );
+      VERIFY( out.base() == y.begin()+3 );
       VERIFY( ranges::equal(y, z) && ranges::equal(x, z) );
     }
 }
diff --git a/libstdc++-v3/testsuite/25_algorithms/partial_sort/constrained.cc b/libstdc++-v3/testsuite/25_algorithms/partial_sort/constrained.cc
index 430e3c0b61b..3b61fe73fd7 100644
--- a/libstdc++-v3/testsuite/25_algorithms/partial_sort/constrained.cc
+++ b/libstdc++-v3/testsuite/25_algorithms/partial_sort/constrained.cc
@@ -40,9 +40,9 @@ test01()
       std::iota(vref.begin(), vref.end(), 0);
       std::vector<int> v1(vref), v2(vref);
       test_container<int, random_access_iterator_wrapper> c
-	= {&v1[0], &v1[0] + size};
+	= {v1.data(), v1.data() + size};
       test_range<int, random_access_iterator_wrapper> r
-	= {&v2[0], &v2[0] + size};
+	= {v2.data(), v2.data() + size};
 
       std::ranlux48_base g1(size), g2(size + 1);
       ranges::shuffle(c, g1);
diff --git a/libstdc++-v3/testsuite/25_algorithms/partial_sort_copy/constrained.cc b/libstdc++-v3/testsuite/25_algorithms/partial_sort_copy/constrained.cc
index 6b586f885dd..519c41f2bde 100644
--- a/libstdc++-v3/testsuite/25_algorithms/partial_sort_copy/constrained.cc
+++ b/libstdc++-v3/testsuite/25_algorithms/partial_sort_copy/constrained.cc
@@ -49,15 +49,15 @@ test01()
       for (unsigned middle = 0; middle < 10; ++middle)
 	{
 	  test_container<int, forward_iterator_wrapper> c
-	    = {&v1[0], &v1[0] + size};
+	    = {v1.data(), v1.data() + size};
 	  test_range<int, input_iterator_wrapper> r
-	    = {&v2[0], &v2[0] + size};
+	    = {v2.data(), v2.data() + size};
 
 	  std::vector<int> o1(middle), o2(middle);
 	  test_range<int, random_access_iterator_wrapper> w1
-	    = {&o1[0], &o1[0]+middle};
+	    = {o1.data(), o1.data()+middle};
 	  test_range<int, random_access_iterator_wrapper> w2
-	    = {&o2[0], &o2[0]+middle};
+	    = {o2.data(), o2.data()+middle};
 
 	  auto [in1, out1] = ranges::partial_sort_copy(c.begin(), c.end(),
 						       w1.begin(), w1.end(),
diff --git a/libstdc++-v3/testsuite/25_algorithms/shuffle/constrained.cc b/libstdc++-v3/testsuite/25_algorithms/shuffle/constrained.cc
index b96343aecce..3f976005b37 100644
--- a/libstdc++-v3/testsuite/25_algorithms/shuffle/constrained.cc
+++ b/libstdc++-v3/testsuite/25_algorithms/shuffle/constrained.cc
@@ -42,9 +42,9 @@ test01()
       std::iota(vref.begin(), vref.end(), 0);
       std::vector<int> v1(vref), v2(vref);
       test_container<int, random_access_iterator_wrapper> c
-	= {&v1[0], &v1[0] + size};
+	= {v1.data(), v1.data() + size};
       test_range<int, random_access_iterator_wrapper> r
-	= {&v2[0], &v2[0] + size};
+	= {v2.data(), v2.data() + size};
 
       std::ranlux48_base g1(size), g2(size + 1);
       VERIFY( ranges::shuffle(c, g1) == c.end() );
diff --git a/libstdc++-v3/testsuite/25_algorithms/sort/constrained.cc b/libstdc++-v3/testsuite/25_algorithms/sort/constrained.cc
index d8227773ccb..b5a99b73cc3 100644
--- a/libstdc++-v3/testsuite/25_algorithms/sort/constrained.cc
+++ b/libstdc++-v3/testsuite/25_algorithms/sort/constrained.cc
@@ -40,9 +40,9 @@ test01()
       std::iota(vref.begin(), vref.end(), 0);
       std::vector<int> v1(vref), v2(vref);
       test_container<int, random_access_iterator_wrapper> c
-	= {&v1[0], &v1[0] + size};
+	= {v1.data(), v1.data() + size};
       test_range<int, random_access_iterator_wrapper> r
-	= {&v2[0], &v2[0] + size};
+	= {v2.data(), v2.data() + size};
 
       std::ranlux48_base g1(size), g2(size + 1);
       ranges::shuffle(c, g1);
diff --git a/libstdc++-v3/testsuite/25_algorithms/stable_sort/constrained.cc b/libstdc++-v3/testsuite/25_algorithms/stable_sort/constrained.cc
index 23a8c03b519..ef02ccaae45 100644
--- a/libstdc++-v3/testsuite/25_algorithms/stable_sort/constrained.cc
+++ b/libstdc++-v3/testsuite/25_algorithms/stable_sort/constrained.cc
@@ -44,9 +44,9 @@ test01()
       std::iota(vref.begin(), vref.end(), 0);
       std::vector<int> v1(vref), v2(vref);
       test_container<int, random_access_iterator_wrapper> c
-	= {&v1[0], &v1[0] + size};
+	= {v1.data(), v1.data() + size};
       test_range<int, random_access_iterator_wrapper> r
-	= {&v2[0], &v2[0] + size};
+	= {v2.data(), v2.data() + size};
 
       std::ranlux48_base g1(size), g2(size + 1);
       ranges::shuffle(c, g1);
